Dr. A. Giinther on Reptiles from China. 171 



17. Tropidonotus annularis^ Hallow. 



Common. 



18. Tropidonotus tigrinuSj Boie. 



Very common. 



19. Ophites septentrionalisj Gthr. 



One specimen. 



20. hycodon rufozonatus^ Cant. 

 Common. 



21. Bungarus semifasciatusy Kuhl. 



One specimen. 



22. Callophis annularis^ Gthr. 



One specimen. 



23. Halys Blomhoffii, Boie. 

 Common. 



24. Halys acutus, sp. n. (PI. XII.) 



This new species may be at once recognized by the upper 

 part of the extremity of the snout being produced into a short, 

 flexible, pointed lobe which projects from between the ante- 

 rior frontal and the rostral shield. The anterior frontals are 

 small, longer than broad ; the posterior very large, inter- 

 mediate in size between the anterior frontals and the occipi- 

 tals. Eye surrounded by a ring of small orbitals, of which 

 those in front are rather elongate ; that below the eye is like- 

 wise long and crescent-shaped, separated by a small postocuhxr 

 from the superciliary shield. Seven upper labials, of which 

 the second forms the anterior wall of the antorbital pit, the 

 third and fourth being the largest. A series of three large 

 temporal shields occupies the lower part of the temple, the 

 space between this series and the occipital being covered by 

 ordinary scales. 



Scales strongly keeled, the keels forming a high sharp 

 ridge on the posterior part of the body. Each scale bears, 

 besides the keel, on its extremity a pair of very small nodules j 

 scales in twenty-one rows. Ventral shields 160 ; anal entire ; 

 subcaudals 60, of which the six or twenty anterior may be 

 single. Extremity of the tail compressed, covered with com- 

 paratively large vertical scutes, and terminating in a long and 

 compressed spine. 



